Rear drum to disc conversion question, Do I need to do anything with the master cylinder? Options

[GriffGirl]

Someone told me he thought I will need to do something with/replace my master cylinder when I convert my rear drum brakes to disc brakes; something about the proportioning valve.

Here's what he said:

In regard to your brake swap, I could be wrong, but I'm almost positive that you'll need a different proportioning valve...When you do it, though, you should see about swapping the proportioning valve and
master cylinder (if it's different on the GTs)... Drum brake wheel cylinders and disc brake calipers use different amounts of fluid (typically) and if you swap from the former to the latter, your rear discs brakes won't be doing as much work as they should.

This is all greek to me. Help? Is this something I should look further in to?

[njccmd2002]

ok pretty much what he tried to say.

you apply the brakes, that is 100% force.

the master cylinder spreads the force to a 60% to the front and 40 % on the back ( hypothetical )

so by changing the configuration too much or too less % will get to the back.

IDK, thats the way i was explained, i coudl be rong. maybe it does not even matter. you will need to get the braking specs of the drums and calipers.

Maybe it does not matter, hope it helps.